Thanks !

Not a native speaker, so don't put too much faith in my answer, but: for me, it means actual left, faaaar left, not the milquetoast leftf-wing parties that sometimes win elections in Western Europe.

There's a good measure of gift economy, for example. We share many resources, grow food for each other (I do squash, a neighbor does leek, and so on--but we don't trade, we just take what we need.) When we need musclepower we just pass the word around and strangers or friends come build a wall / clean out an old barn / stack firewood. There's a buy-nothing warehouse were we drop everything from clothes to building materials, toys, kitchenware, and art supplies.
I volunteer to manage a pay-what-you-want hostel for hikers. There's a lot of grassroot community politics / activism. It's nice.